/**
 * 项目名称：quickstart-datasource 
 * 文件名：BatchingWithPrepareStatement.java
 * 版本信息：
 * 日期：2018年10月15日
 * Copyright yangzl Corporation 2018
 * 版权所有 *
 */
package org.quickstart.database.datasource.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * BatchingWithPrepareStatement
 * 
 * @author：youngzil@163.com
 * @2018年10月15日 下午9:43:00
 * @since 1.0
 */
public class BatchingWithPrepareStatement {
    // JDBC driver name and database URL
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost/EMP";

    // Database credentials
    static final String USER = "root";
    static final String PASS = "123456";

    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement stmt = null;
        try {
            // Register JDBC driver
            Class.forName("com.mysql.jdbc.Driver");

            // Open a connection
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);

            // Create SQL statement
            String SQL = "INSERT INTO Employees(id,first,last,age) " + "VALUES(?, ?, ?, ?)";

            // Create preparedStatemen
            System.out.println("Creating statement...");
            stmt = conn.prepareStatement(SQL);

            // Set auto-commit to false
            conn.setAutoCommit(false);

            // First, let us select all the records and display them.
            printRows(stmt);

            // Set the variables
            stmt.setInt(1, 400);
            stmt.setString(2, "Python");
            stmt.setString(3, "Zhang");
            stmt.setInt(4, 33);
            // Add it to the batch
            stmt.addBatch();

            // Set the variables
            stmt.setInt(1, 401);
            stmt.setString(2, "C++");
            stmt.setString(3, "Huang");
            stmt.setInt(4, 31);
            // Add it to the batch
            stmt.addBatch();

            // Create an int[] to hold returned values
            int[] count = stmt.executeBatch();

            // Explicitly commit statements to apply changes
            conn.commit();

            // Again, let us select all the records and display them.
            printRows(stmt);

            // Clean-up environment
            stmt.close();
            conn.close();
        } catch (SQLException se) {
            // Handle errors for JDBC
            se.printStackTrace();
        } catch (Exception e) {
            // Handle errors for Class.forName
            e.printStackTrace();
        } finally {
            // finally block used to close resources
            try {
                if (stmt != null)
                    stmt.close();
            } catch (SQLException se2) {
            } // nothing we can do
            try {
                if (conn != null)
                    conn.close();
            } catch (SQLException se) {
                se.printStackTrace();
            } // end finally try
        } // end try
        System.out.println("Goodbye!");
    }// end main

    public static void printRows(Statement stmt) throws SQLException {
        System.out.println("Displaying available rows...");
        // Let us select all the records and display them.
        String sql = "SELECT id, first, last, age FROM Employees";
        ResultSet rs = stmt.executeQuery(sql);

        while (rs.next()) {
            // Retrieve by column name
            int id = rs.getInt("id");
            int age = rs.getInt("age");
            String first = rs.getString("first");
            String last = rs.getString("last");

            // Display values
            System.out.print("ID: " + id);
            System.out.print(", Age: " + age);
            System.out.print(", First: " + first);
            System.out.println(", Last: " + last);
        }
        System.out.println();
        rs.close();
    }// end printRows()
}// end JDBCExample
